Side weirs are widely used to divert flows from rivers and channels. However, the hydraulic behavior of this type of weir is complex and difficult to predict accurately. Previous studies on side weirs have generally focused on side weirs in rectangular channels with a smooth bed. However, one of the applications of side weirs is in irrigation systems which have trapezoidal cross sections and significant bed roughness. The present study investigates the hydraulic behavior of a broad crested side weir in an earthen channel with a rough bed under subcritical flow. These investigations showed that the side weir discharge coefficient is influenced by four main parameters which are upstream Froude number, ratio of the main channel width to the upstream flow depth, ratio of the length of the side weir to the main channel width and ratio of side weir height to the upstream flow depth. The results showed that the discharge coefficient of the side weir gives a lower coefficient value compared to other researchers’ equations. Nearly 90 experimental tests were carried out and finally new equations are proposed for prediction of discharge coefficient of a broad crested side weir in an earthen channel under subcritical conditions which can be mainly used in common irrigation systems.
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Research Article|
February 01 2013
Discharge coefficient of a broad crested side weir in an earthen channel Available to Purchase
Mohammad Reza Namaee;
1Khaje Nasir Toosi University of Technology, Tehran, Iran
E-mail: [email protected]
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Mohammad Sadegh Jalaledini;
Mohammad Sadegh Jalaledini
2Soil Conservation and Watershed Management Research Institute, Tehran, Iran
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Mahdi Habibi;
Mahdi Habibi
2Soil Conservation and Watershed Management Research Institute, Tehran, Iran
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Saeed Reza Sabbagh Yazdi;
Saeed Reza Sabbagh Yazdi
3Civil Engineering Department, KN Toosi University of Technology, Tehran, Iran
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Mona Ghafouri Azar
Mona Ghafouri Azar
4University of Tehran, Karaj, Iran Postal address: Tehran, Karaj Special Road Km 10, St. Ashry martyr - martyr Shafiee St., PO Box 1136-13445
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Water Supply (2013) 13 (1): 166–177.
Article history
Received:
January 24 2012
Accepted:
July 19 2012
Citation
Mohammad Reza Namaee, Mohammad Sadegh Jalaledini, Mahdi Habibi, Saeed Reza Sabbagh Yazdi, Mona Ghafouri Azar; Discharge coefficient of a broad crested side weir in an earthen channel. Water Supply 1 February 2013; 13 (1): 166–177. doi: https://doi.org/10.2166/ws.2012.081
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